Improved emery-wheel



UNITED STATES THOMAS NELSON, OF WEST TROY, ASSIGNO'B TO NEW YORK QUARTZ GOMPA-NY, OF NEW YORK, N. Y.

lMPROl/ED EMERY WHEEL- Specification forming part of Letters Patent No. li ihbllfi, dated November 1, 1864.

To all whom it may concern;

Be it known that I, THOMAS NELsoN, of West Troy, in the county of Albany and State of New York, have invented, made, and applied to use a certain new and useful Improvement in the Manufacture of Emery Wheels, Slabs, 860;; and I do hereby declare the-f0llowing to be a full, clear, and exact description of thenat'ure ot the said invention and of the features which distinguish the same from other modes of manufacturing emery-Wheels, die.

A composition of india-rubber and emery has heretofore been made fromivhich slabs, wheels, 850., have been formed in molds. This is costly, and only forms a mechanical mix-- torch of Wheels, slabs, rings, or other required shape, and subjecting the same to a suiiicient heat to vitrii'y the mass to the extent required for holding the particles of emery firmly to gether. None of these materials are of a character to interfere with the grinding operation or become sticky, as is the case to a greater or less extent with india-rubber and glue, and the vitrified clay firmly holds the particles to gethe'r, and, Wearing away in use more easily than the emery, leaves the cutting-edges of said particles free and unobstructed for the grinding operations, [Hence such surfaces do not dull nor become glazed with dirt as quickly as the Wheels formerly employed.

The proportion of clay need only be sulficient to fill the interstices between the particles ot' emery when pressed together, and the flux only sufficient in quantity to cause the clay to partially vitrify'at a low temperature. 1 have found that about nine parts of clay and six ofborax, by weight, thoroughly mixed together and rendered plastic by Water, will be suflicient for about twenty-eight-parts ofemery.

ll-are must be taken that the mixing is thorough and uniform, after which the wheel, slab, ring, or other article is formed of said materials by pressure in a suitable mold, and then baked, only sufficient heat being employed to vitrify the clay and flux and not injure the emery by too much heat,

A small proportion of litharge may be employed as a flux, or any desired material may be introduced to impart color to the clay corresponding to the color of the emery.

' What 1 claim, and desire to secure by Letters Patent, is-

Manufacturing wheels, slabs, rings, or other 

